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King Peladon was the king of Peladon in the 39th century, when it was admitted to the Galactic Federation. He met and befriended the Third Doctor and Jo Grant in the final stages of establishing ties to the Federation.
When his father died, the boy king refused to take the throne, but the royal advisors Torbis and Hepesh convinced him to, and his mother allowed it.
Peladon wanted his planet to join the Federation, but Hepesh conspired against him, eventually taking the King hostage. Peladon was rescued by the Third Doctor and Jo Grant, whom he had fallen for, even proposing marriage to her, though she declined.
Peladon later married and had a daughter, Thalira. He told her stories of his time as king. He died while she was still young.